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The setup is based on the frequency up-conversion of a high-power external signal (provided by a Ti:Sapphire laser) and makes use of a relativistic electron bunch as resonating medium.The produced VUV pulses have peak power in MW range, variable polarization, high shot to shot stability and control of the timing parameters at the ps level. In this paper, we present the first characterization of the temporal and spectral features of the emitted light. The radiation can be exploited for new experiments in the fields of dynamical phenomena, non-linear physics, magnetism and biology.

In the figure:Open dots are the CHG amplitude as a function of the relative delay between seed and electron bunch, dashed line is the electron bunch temporal profile as measured with the streak camera, the solid line is the squared bunch profile. The quadratic dependence confirms the coherent character of the emission.